Sarge's utility function is U(X1,X2)= X1*X2. If his marginal rate of substitution (MRS) is 3 and he is currently consuming 12 units of good 1, how many units of good 2 is he consuming? [A] Please put...

Extracted text: Sarge's utility function is U(X1,X2)= X1*X2. If his marginal rate of substitution (MRS) is 3 and he is currently consuming 12 units of good 1, how many units of good 2 is he consuming? [A] Please put your answers in numerical values with no comma or decimal places.